Blue Water Bridge Plaza, 410 Elmwood Street, Port Huron, St. Clair Cou...
Significance: The bridge and plaza were completed in 1938. They are reflections of Depression-era engineering and architecture. The plaza was designed and built by George L. Harvey and Norman B. Forbes. The ... More
Blue Water Bridge Plaza, 410 Elmwood Street, Port Huron, St. Clair Cou...
Significance: The bridge and plaza were completed in 1938. They are reflections of Depression-era engineering and architecture. The plaza was designed and built by George L. Harvey and Norman B. Forbes. The ... More
Blue Water Bridge Plaza, 410 Elmwood Street, Port Huron, St. Clair Cou...
Significance: The bridge and plaza were completed in 1938. They are reflections of Depression-era engineering and architecture. The plaza was designed and built by George L. Harvey and Norman B. Forbes. The ... More
Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...
Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More
New York, New Haven & Hartford Railroad, Groton Bridge, Spanning Thame...
Significance: The Groton Bridge is a Strauss heel trunnion bascule bridge. It is significant as part of the transportation link in the shoreline route of the New York, New Haven and Hartford Railroad, and as a... More
New York, New Haven & Hartford Railroad, Groton Bridge, Spanning Thame...
Significance: The Groton Bridge is a Strauss heel trunnion bascule bridge. It is significant as part of the transportation link in the shoreline route of the New York, New Haven and Hartford Railroad, and as a... More
Honey Run Bridge, Spanning Butte Creek, bypassed section of Honey Run ...
modified Pratt truss (4); 230' long; 3 span, combined wood & iron Significance: The Honey Run Bridge is the best preserved of four surviving examples of Pratt-type wood covered bridges in the United States. Th... More
Honey Run Bridge, Spanning Butte Creek, bypassed section of Honey Run ...
modified Pratt truss (4); 230' long; 3 span, combined wood & iron Significance: The Honey Run Bridge is the best preserved of four surviving examples of Pratt-type wood covered bridges in the United States. Th... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
North Side Point Bridge, Spanning Allegheny River at Point of Pittsbur...
See also HAER PA-3 for additional documentation. Includes written data. Significance: The Manchester Bridge replaced the old wooden Union Bridge, the first bridge erected at the Point and demolished in 1907. B... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
Blue Water Bridge, Spanning St. Clair River at I-69, I-94, & Canadian ...
Significance: When it opened in October 1938, the Blue Water Bridge symbolized the peaceful relationship between the United States and Canada, a sharp contrast to the hostilities in Europe which were about to e... More
Blue Water Bridge, Spanning St. Clair River at I-69, I-94, & Canadian ...
Significance: When it opened in October 1938, the Blue Water Bridge symbolized the peaceful relationship between the United States and Canada, a sharp contrast to the hostilities in Europe which were about to e... More
Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...
Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... More
Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...
Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... More
Greenville Yard, Transfer Bridge System, Port of New York/New Jersey, ...
Significance: The Greenville Yard Transfer Bridge System is the last surviving example in New York Harbor of a suspended-type car float transfer bridge. The innovative design of the transfer bridge was introdu... More
Greenville Yard, Transfer Bridge System, Port of New York/New Jersey, ...
Significance: The Greenville Yard Transfer Bridge System is the last surviving example in New York Harbor of a suspended-type car float transfer bridge. The innovative design of the transfer bridge was introdu... More
Eighteenth Street Bridge, Saint Louis, Independent City, MO
Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More
Employees of American Bridge Company (United States Steel). Ambridge, ...
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... More
Bush Terminal Company, Pier 5, Opposite end of Forty-first Street on U...
Significance: Pier 5 was typical of the substructures and piersheds built by Irving Bush c. 1902-09, sheet-piling-retained fill. It survives partly intact, and retains the best evidence of late attempts to mod... More
Bush Terminal Company, Pier 5, Opposite end of Forty-first Street on U...
Significance: Pier 5 was typical of the substructures and piersheds built by Irving Bush c. 1902-09, sheet-piling-retained fill. It survives partly intact, and retains the best evidence of late attempts to mod... More
Chicago & Northwestern Railroad Bridge, Spanning Eagle River, Eagle Ri...
Significance: The Chicago and Northwestern (CNW) Railroad Bridge is a 337', multi-span, riveted, steel, deck plate girder structure that was constructed in 1902. Built by the American Bridge Company, the trestl... More
St. Charles Air Line Bridge, Spanning South Branch of Chicago River, n...
Significance: Like all Strauss heel-trunnion bascule bridges, the St. Charles Air Line Bridge rotates vertically, lifting to clear the river it spans. This particular bridge is unique, however, in that its des... More
Steel Bridge, Spanning Willamette River at State Route 99, Portland, M...
Significance: An early example of the Waddell-type vertical lift bridge, the Steel Bridge documents that, guided by Harrington, most features of the type achieved "standard" form by 1912. It also demonstrates ... More
Steel Bridge, Spanning Willamette River at State Route 99, Portland, M...
Significance: An early example of the Waddell-type vertical lift bridge, the Steel Bridge documents that, guided by Harrington, most features of the type achieved "standard" form by 1912. It also demonstrates ... More
Sparkman Street Bridge, Spanning Cumberland River, Nashville, Davidson...
Significance: The bridge possesses state level engineering significance as an example of the through Parker and camelback truss types for its uncommon concrete trusses. The bridge possesses local significance a... More
Baltimore & Ohio Railroad, Harpers Ferry Station, Potomac Street, Harp...
Significance: The train station at Harpers Ferry provides an excellent opportunity to study the relationship between railroad engineering and railroad economics. Designed by architect E. Francis Baldwin, the s... More
Baltimore & Ohio Railroad, Harpers Ferry Station, Potomac Street, Harp...
Significance: The train station at Harpers Ferry provides an excellent opportunity to study the relationship between railroad engineering and railroad economics. Designed by architect E. Francis Baldwin, the s... More
Baltimore & Ohio Railroad, Harpers Ferry Station, Potomac Street, Harp...
Significance: The train station at Harpers Ferry provides an excellent opportunity to study the relationship between railroad engineering and railroad economics. Designed by architect E. Francis Baldwin, the s... More
Mystic River Bridge, Spanning Mystic River at U.S. Route 1, Groton, Ne...
Significance: The Mystic River Bridge is significant as an example of the Brown Balance Beam Bascule, an innovative design that raised movable-bridge technology to a new level of refinement in the early 20th ce... More
Mystic River Bridge, Spanning Mystic River at U.S. Route 1, Groton, Ne...
Significance: The Mystic River Bridge is significant as an example of the Brown Balance Beam Bascule, an innovative design that raised movable-bridge technology to a new level of refinement in the early 20th ce... More
Mystic River Bridge, Spanning Mystic River at U.S. Route 1, Groton, Ne...
Significance: The Mystic River Bridge is significant as an example of the Brown Balance Beam Bascule, an innovative design that raised movable-bridge technology to a new level of refinement in the early 20th ce... More
U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...
See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More
U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...
See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More
U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...
See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More
U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...
See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More
U.S. Steel Homestead Works, Blast Furnace Plant, Along Monongahela Riv...
See also HAER PA-200 for additional documentation. Includes written data (pages 76 through 94). Significance: As a group, the structures and steel-making equipment from Homestead Works represented one of the na... More
Centennial Bridge, Spanning Mississippi River at U.S. Highway 61, Dave...
Significance: This bridge is a major river span and was the first tied-arch span across the Mississippi River. The bridge was fabricated, and the superstructure built, by American Bridge Company, New York, one... More
Centennial Bridge, Spanning Mississippi River at U.S. Highway 61, Dave...
Significance: This bridge is a major river span and was the first tied-arch span across the Mississippi River. The bridge was fabricated, and the superstructure built, by American Bridge Company, New York, one... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
New York, New Haven & Hartford Railroad, Mystic River Bridge, Spanning...
Significance: The Mystic River Bridge is a center bearing, through truss swing bridge. It is significant as part of the transportation link in the shoreline route of the New York, New Haven and Hartford Railro... More
Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...
The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More
Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...
The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More
Charlestown Navy Yard, Shipfitters' Shop, Southeast side of First Aven...
The Boston Redevelopment Authority hired William A. Owens to document all buildings in the Charlestown Navy Yard in 1977, most of which were exterior photographs. Significance: The Charlestown Navy Yard comple... More
Poplar Grove Road Bridge, Spanning Chicago & Northwestern Railroad, Le...
Significance: The Poplar Grove Road Bridge utilizes a single span, two lane, Warren Double-Intersection pony truss. Erected in 1883 by the Alden and Lassig Bridge and Iron Works of Chicago for the Chicago & Nor... More
Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...
Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More
Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...
Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More
Williamstown-Marietta Bridge, Spanning Ohio River between Williamstown...
Significance: The Williamstown-Marietta Bridge was the first highway bridge in the United States built in a cantilever fashion over an inland river. In 1902, it was the site of the first strike by the newly-fo... More
General Dynamics Corporation Shipyard, Wellman-Seaver Crane, 97 Howard...
Significance: Erected in 1901, Structure No. 30S, the Wellman-Seaver Folding Gantry Crane, or Crane S-1, is significant as the oldest and longest-operating crane in the Quincy-Fore River Shipyard. Located on P... More
Snowden Bridge, Spanning Missouri River, Nohly, Richland County, MT
Survey number: HAER MT-27 Building/structure dates: 1913 Initial Construction Building/structure dates: 1925 Subsequent Work
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Seven Mile Bridge, Linking Florida Keys, Marathon, Monroe County, FL
Significance: At the time the Florida East Coast Railway constructed this bridge it was acclaimed as the longest bridge in the world, an engineering marvel. It was the most costly of all Flagler's bridges in t... More
Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...
Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More
South High Street Bridge, South High Street, spanning Little Juniata C...
Significance: The South High Street Bridge is one of four surviving lenticular truss bridges in the Commonwealth of Pennsylvania and one of fifty remaining in the United States. The truss derives its name from... More
Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...
Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More
Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...
Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More
Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...
Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More
Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...
Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More
Southern Pacific Railroad Shasta Route, Bridge No. 210.52, Milepost 21...
Significance: The Southern Pacific Railroad Shasta Route, built as the California and Oregon Railroad and the Central Pacific Railroad between Roseville, California and Portland, Oregon was the first thrust nor... More
U.S. Steel Homestead Works, Along Monongahela River, north of Eighth A...
Significance: Established in 1879, Homestead Works is one of six plants (Homestead, Edgar Thomson, Duquesne, Irvin, National and Clairton) which, until the collapse in 1982, comprised U.S. Steel's Mon Valley wo... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Fort Madison Bridge, Spanning Mississippi River at U.S. Highway 61, Fo...
Significance: This bridge is a major river span and had, at the time of its construction, the longest and heaviest electrified swing span on the Mississippi River. The bridge superstructure was built by Americ... More
Fort Madison Bridge, Spanning Mississippi River at U.S. Highway 61, Fo...
Significance: This bridge is a major river span and had, at the time of its construction, the longest and heaviest electrified swing span on the Mississippi River. The bridge superstructure was built by Americ... More
Gibbon River Bridge No. 1, Spanning Gibbon River at Grand Loop Road, L...
Significance: Gibbon River Bridge I typifies the early design philosophy of the National Park Service, which was to use indigenous materials to harmonize manmade features with their natural surroundings. This ... More
Chicago River Bascule Bridge, Outer Drive, Spanning Chicago River at O...
Significance: At the time of its completion in 1937, the Outer Drive Bridge was the longest and widest bascule bridge in the world. Survey number: HAER IL-54 Building/structure dates: 1929 Initial Constructio... More
Susquehanna River Bridge, Spanning Susquehanna River, Havre de Grace, ...
Significance: The Susquehanna River Bridge was constructed in 1908 to replace an older, timber Howe truss structure. The first bridge built by the B&O Railroad on this site consisted of twelve 250 foot spans, ... More
South Fork Trinity River Bridge, State Highway 299 spanning South Fork...
Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More
South Fork Trinity River Bridge, State Highway 299 spanning South Fork...
Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More
South Fork Trinity River Bridge, State Highway 299 spanning South Fork...
Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crosse... More
St. Louis Avenue Viaduct, Spanning Kansas City Terminal Railroad at Be...
Significance: The St. Louis Avenue Viaduct is the oldest of only nine known extant skewed Pratt truss bridges, a rather uncommon bridge form, in Missouri. Furthermore, its fifty-foot width is unusual for a bri... More
Augustine Bridge, Brandywine River,Augustine Cutoff, Wilmington, New C...
Significance: Wrought iron, pin-connected, Pratt-type truss superstructure mounted on granite masonry piers; originally served as bridge for the B&O Railroad. Survey number: HAER DE-20 Building/structure date... More
Ross Island Bridge, Spanning Willamette River at Powell Boulevard, Por...
Significance: The Ross Island Bridge is one in an ensemble of twelve monumental highway bridges across the lower Willamette River. It is one of five Portland spans (with Burnside, Sellwood, Lovejoy Viaduct, an... More
Southern Railway Company, Spencer Shops, Salisbury Avenue between Thir...
Significance: The Spencer Shops served as the largest maintenance and repair facility in the Southern Railway Company system. The extant structures provide important indications of the requirements of large sc... More
West End-North Side Bridge, Spanning Ohio River, approximately 1 mile ...
Photographs cover approach spans only; Ohio River span not shown. Significance: After two decades of agitation by the local business community, the West End-North Side Bridge was completed in 1932 by the Americ... More
Charleroi-Monessen Bridge, Spanning Monongahela River at State Route 2...
Significance: It is significant as a rare surviving example of a long, multiple-span metal truss bridge. Built as a toll bridge to carry vehicular, pedestrian, and trolley traffic across the Monongahela River, ... More
U.S. Steel Edgar Thomson Works, Blast Furnace Plant, Along Monongahela...
Survey number: HAER PA-384-A Building/structure dates: 1898 Initial Construction Building/structure dates: 1916 Subsequent Work Building/structure dates: 1927 Subsequent Work Building/structure dates: 1941-... More
Monongahela Connecting Railroad Company, Main Bridge, Spanning Mononga...
Significance: Major connection between the north and south sides of the plant which was separated by the Monongahela River. Practically all of the intra-mill transfer of materials crossed this bridge during th... More
Salinas River Bridge, Spanning Salinas River on Chualar River Road, Ch...
Significance: The Salinas River Bridge on Chualar River Road is an eight-span, pin-connected Pratt through truss bridge. As such, it is the largest multiple-span through truss bridge, particularly of its perio... More
Cuttingsville Bridge, Spanning Mill River at State Route 103, Shrewsbu...
Significance: The bridge is significant as a representative example of the bridges built following the flood of 1927, in which over 1250 of Vermont's bridges were destroyed. The flood was a major episode in Ve... More
Lehigh Valley Railroad, Delaware River Bridge, Spanning Delaware River...
Significance: This structure occupies the piers of the first railroad bridge to cross the Delaware River at Easton. It is also notable for its fish-belly deck trusses, an unusual variant of the Pratt design. U... More
U.S. Steel Duquesne Works, Heat Treatment Plant, Along Monongahela Riv...
See also HAER PA-115 for additional documentation. Includes written data (pages 182 through 189). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More